An electronic control unit for an internal combus-tion engine

摘要

Disclosed is an electronic control unit, ECU, for an internal combustion engine 110 having a crankshaft 145 coupled to a starter motor 195 and to a fuel pump 180 in fluid communication with a fuel rail 170. The electronic control unit is configured to activate the starter 195 to rotate the crankshaft 145 for a predetermined cranking time, monitor an engine speed during the cranking time, monitor an angular position of the crank­shaft 145 during the cranking time, monitor 615 a pressure variation within the fuel rail 170 during the cranking time. The ECU uses the engine speed, the crankshaft angular position and the pressure variation to determine a crankshaft angular displacement between a top dead center position of a fuel pump piston and a reference angular position of the crankshaft 145.